Thanks for the clarification about the correct taxable amount being allowed to be entered, but since there is no e-filed Form 8606 for the inherited IRA there would be a lack of data which would flag the return.
I can see what might be an analogous situation where an IRA distribution has a QCD. On the 1040 both the gross distribution, and the taxable portion (less the QCD) is shown, but the IRS doesn't require detail of all the donations (though the taxpayer keep records).
